在nginx的access.log中存在大量的400錯誤，並以每天幾百M的速度增加，佔用大量空間。
事例

106.236.228.100 - - [11/Apr/2014:11:00:15 +0800] "-" 400 0 "-" "-"
106.236.228.100 - - [11/Apr/2014:11:00:15 +0800] "-" 400 0 "-" "-"
106.236.228.100 - - [11/Apr/2014:11:00:15 +0800] "-" 400 0 "-" "-"
106.236.228.100 - - [11/Apr/2014:11:00:15 +0800] "-" 400 0 "-" "-"
106.236.228.100 - - [11/Apr/2014:11:00:15 +0800] "-" 400 0 "-" "-"
119.917.196.7 - - [11/Apr/2014:11:00:16 +0800] "-" 400 0 "-" "-"
119.917.196.7 - - [11/Apr/2014:11:00:16 +0800] "-" 400 0 "-" "-"
116.236.228.180 - - [11/Apr/2014:11:00:16 +0800] "-" 400 0 "-" "-"

解決方法如果你主機綁定根目錄直接修改nginx.confg即可若是你有新建虛擬機許修改相應的域名配置文件
打開配置文件原始内容為

server
        {
                listen       80;
                server_name xxx.com;
                index index.html index.htm index.php default.html default.htm default.php;
                root  /home/wwwroot/xxx;

現在只需添加一個詞default即可添加在listen 80; 的80後邊即listen 80 default;
修正完成后的内容為

server
        {
                listen       80 default;
                server_name xxx.im;
                index index.html index.htm index.php default.html default.htm default.php;
                root  /home/wwwroot/xxx;

也可以直接關閉日誌

access_log off

重啓nginx

/etc/init.d/nginx restart